We follow the Bayesian fitting method described by [1]} to determine the integrated radio spectrum of Cygnus A, based on previous measurements at several frequencies between 12.6 MHz and 14.6509 GHz. We find that a 3rd order polynomial of the form,
\(S[{\rm Jy}] = A_0 \prod ^{N}_{i=1-3}10^{A_i\log ^i_{10}(\nu /[{\rm 150~MHz}])},\) 
